ddos attacks

[sgraun () airstreamcomm net]

I’m curious to know what other service providers are doing to 
alleviate/prevent ddos attacks from happening in your network.  Are you 
completely reactive and block as many addresses as possible or null0 
traffic to the effected host until it stops or do you block certain 
ports to prevent them.  What’s the best way people are dealing with 
them?

Scott